Bosch Washing Machine Repair: Summary of Experience with Slower Drainage Speed in Fully Automatic Washing Machines
Analysis and Maintenance: This fault is generally caused by the drainage valve not being fully opened or the drainage pipe being blocked. Specific causes and solutions are as follows:
1. Blockage in the drain valve or deformation of the drain hose due to bending. Simply clearing the debris from the drain valve or replacing the drain hose will resolve the issue.
2. Increased clearance between the drain lever and the rubber valve. Properly adjusting to reduce the gap between the drain lever and the rubber valve will solve the problem.
3. The spring inside the drain valve is too long or has lost its elasticity. Simply replace the internal spring.
4. The moving core of the drain electromagnetic valve has excessive damping or reduced suction force. Clean the rust and dirt inside the electromagnet or replace the drain electromagnetic valve.
Source of Article: http://blog.tianya.cn/blogger/blog_main.asp?BlogID=3446026.